Industrial Chiller Antifreeze Selection Guide for Cold Weather Protection

When temperatures drop below 0°C, the cooling water inside an industrial chiller may face a hidden risk: freezing expansion. As water turns to ice, its volume increases and can generate enough pressure to rupture metal pipes, damage seals, deform pump components, or even crack the heat exchanger. The result may range from costly repairs to full production downtime.
The most effective way to avoid winter failures is to choose and use antifreeze correctly.

Key Criteria for Selecting Antifreeze
To ensure reliable performance in low-temperature environments, the antifreeze used in industrial chillers should meet the following requirements:
* Strong Freeze Protection: Adequate ice-point protection based on the local minimum ambient temperature.
* Corrosion Resistance: Compatible with copper, aluminum, stainless steel, and other system metals.
* Seal Compatibility: Safe for rubber and plastic sealing materials without swelling or degradation.
* Stable Circulation: Maintains reasonable viscosity at low temperatures to avoid excessive pump load.
* Long-Term Stability: Resists oxidation, precipitation, and degradation during continuous operation.

Preferred Option: Ethylene Glycol–Based Antifreeze
Ethylene glycol antifreeze is widely used in industrial cooling systems thanks to its high boiling point, low volatility, and excellent chemical stability. It is ideal for closed-loop systems running long hours.
* For food, pharmaceutical, or hygiene-sensitive industries: Use propylene glycol antifreeze, which is non-toxic but more costly.
* Strictly avoid: Alcohol-based antifreeze such as ethanol. These volatile liquids can cause vapor lock, seal damage, corrosion, and serious safety risks.

Recommended Mixing Ratio
A correct glycol concentration ensures protection without compromising cooling efficiency.
* Standard ratio: 30% ethylene glycol + 70% deionized or purified water
This provides a good balance between freeze protection, corrosion resistance, and heat transfer.
* For harsher winters: Increase concentration slightly as needed, but avoid excessive glycol levels that raise viscosity and reduce heat dissipation.

Flushing and Replacement Guidelines
Antifreeze is not recommended for year-round use. When the ambient temperature remains above 5°C, do the following:
1. Drain the antifreeze completely.
2. Flush the system with purified water until the discharge is clear.
3. Refill the chiller with purified water as the normal cooling medium.

Do Not Mix Antifreeze Brands
Different antifreeze brands use different additive systems. Mixing them may cause chemical reactions, resulting in sediment, gel formation, or corrosion. Always use the same brand and model throughout the system, and clean thoroughly before changing products.

Protect Your Industrial Chiller and Your Production Line
Using qualified antifreeze in winter protects not only the industrial chiller but also the continuity and reliability of the entire production process. Proper preparation ensures stable chiller performance even during extreme cold.

If you need assistance with antifreeze selection or industrial chiller winterization, the TEYU technical support team is ready to provide professional guidance to help your equipment operate safely through the winter.